Will it automatically change my system prompts?

By default, the skill focuses on model strings and API headers. Behavioral prompt adjustments are only applied if the user explicitly requests them or reports specific issues.

Does this skill support Claude Haiku migration?

No, this skill is specifically designed for migrating to Opus 4.5 from Sonnet 4.0/4.5 or Opus 4.1. It does not handle Haiku model transitions.

How does it handle the new Opus 4.5 behavioral differences?

The skill provides targeted prompt adjustments for common issues like tool overtriggering, over-engineering, and sensitivity to 'thinking' terminology when extended thinking is disabled.

Which cloud providers are covered by the model string updates?

It provides automated updates for the Anthropic API (1P), AWS Bedrock, Google Vertex AI, and Azure AI Foundry.

Claude Opus 4.5 Migration

Name: Claude Opus 4.5 Migration
Author: Microck

byMicrock

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Cloud Infrastructure

Migrates codebases and prompts from earlier Claude models to the Opus 4.5 architecture across all major cloud platforms.

This skill facilitates a seamless one-shot migration from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to the more advanced Opus 4.5 model. It automates the identification and replacement of platform-specific model strings for the Anthropic API, AWS Bedrock, Google Vertex AI, and Azure AI Foundry. Beyond simple string replacement, it intelligently adjusts system prompts to mitigate Opus 4.5-specific behavioral nuances, such as tool overtriggering, over-engineering, and word sensitivity, ensuring your application remains performant and reliable after the upgrade.

Key Features

0181 GitHub stars

02Removal of unsupported context-1m beta headers with documentation

03Prompt optimization to prevent over-engineering and excessive file creation

04Automatic insertion of the high-effort parameter for complex reasoning tasks

05Automated model string updates for Anthropic, AWS, GCP, and Azure

06Tool usage calibration to stop overtriggering in system instructions

Use Cases

01Refining system prompts that exhibit behavioral regressions after switching to Opus 4.5

02Standardizing model strings across multi-cloud environments during an AI stack refresh

03Upgrading a production LLM application from Opus 4.1 to 4.5 for better reasoning capabilities

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add microck/ordinary-claude-skills claude-opus-4-5-migration

For use in Claude.ai and ChatGPT

Download Skill